Method PowerSet

corpus/java/training/guava/collect/Sets.java:1332–1336

(Set<E> input)

    final ImmutableMap<E, Integer> inputSet;

    PowerSet(Set<E> input) {
      this.inputSet = Maps.indexMap(input);
      checkArgument(
          inputSet.size() <= 30, "Too many elements to create power set: %s > 30", inputSet.size());
    }

    @Override
    public int size() {